Ambrose says the county's support is critical to the museum's operation.

"The immediate impact might be that we would have to close the doors of our museum right now while we find replacement funding. It would mean, as I was suggesting in comments to the commission, that it would set back programs that are already in place for this summer and for the fall," Ambrose said.

Ambrose says they don't plan to stop construction on the new Tubman museum, which is expected to open next spring.